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Phytotoxicity of 2,4-D and 2,4-Dichlorophenol to Red Clover (Trifolium pratense)

Published online by Cambridge University Press:  12 June 2017

S. G. Taylor ,
D. G. Shilling ,
K. H. Quesenberry  and
G. R. Chaudhry
S. G. Taylor
Affiliation:
Agron. Dep., Univ. Florida, Gainesville, FL 32611
D. G. Shilling
Affiliation:
Agron. Dep., Univ. Florida, Gainesville, FL 32611
K. H. Quesenberry
Affiliation:
Agron. Dep., Univ. Florida, Gainesville, FL 32611
G. R. Chaudhry
Affiliation:
Soil Sci. Dep., Univ. Florida, Gainesville, FL 32611
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Abstract

Whole plant and tissue culture experiments were conducted to determine the difference in phytotoxicity of 2,4-D and its metabolite, 2,4-DCP, to red clover. At the whole plant level, the mean concentration of 2,4-DCP (10 mM) required to cause 50% growth inhibition (I50) of shoot dry weight was 24 times greater than for 2,4-D (0.42 mM). Using callus tissue, the I50 value for 2,4-DCP (0.28 mM) was 22 times greater than for 2,4-D (0.013 mM) based on dry weights. The callus tissue was 36 and 32 times more sensitive to 2,4-DCP and 2,4-D than shoot tissue based on dry weights, respectively. These data indicate that 2,4-DCP was less phytotoxic than 2,4-D to red clover both in vitro and in vivo.

Keywords

2,4-D (2,4-dichlorophenoxy)acetic acid2,4-DCP, 2,4-dichlorophenolred clover, Trifolium pratense L.Herbicide toleranceherbicide metabolitetissue culturecallus
Type
Special Topics
Information
Weed Science , Volume 37 , Issue 6 , November 1989 , pp. 825 - 829
Copyright
Copyright © 1989 by the Weed Science Society of America 

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